Darren, Cris and list,
when you review your design, there is a menu entry "Explore->Covariance
structure". Select this and browse through your error covariance
components to see, whether your assumptions about equal variances and
dependent errors are modelled as you would expect. Note that the order of
your files might be changed by spm_config_factorial_design.
Volkmar
On Wed, 13 Sep 2006, Darren G wrote:
> Dear Volkmar
>
> This may be part of the reason for my problem as well in the design
> estimation. When you advise that he "check the covariance components" could
> you explain further to me. If I was going to check this what should I look
> for?
>
> Darren
>
> >-----Original Message-----
> >From: SPM (Statistical Parametric Mapping)
> >[mailto:[log in to unmask]] On Behalf Of Volkmar Glauche
> >Sent: Wednesday, September 13, 2006 7:36 AM
> >To: [log in to unmask]
> >Subject: Re: [SPM] Flexible factorial design error
> >
> >Dear Cris,
> >
> >I am working on this one... However, I just came across
> >another serious bug, so there is not a perfect solution yet. I
> >will send you some code in private mail, but please check the
> >covariance components carefully before you estimate the
> >design. The code seems to leave out some of them.
> >
> >Volkmar
> >
> >On Wed, 13 Sep 2006, Cris Lanting wrote:
> >
> >> Dear SPM list,
> >>
> >> As mentioned earlier by M. Buehler and B.Suchan there seems to be a
> >> bug in the covariance component specification when using a flexible
> >> factorial design (ANOVA) with in my case a 3x2x2 design
> >> (3 factors, 2 levels, 2 levels)
> >>
> >>
> >> Temporal non-sphericity (over voxels) :
> >...REML estimation
> >> ??? Error using ==> plus
> >> Matrix dimensions must agree.
> >>
> >> Error in ==> spm_reml at 87
> >> C = C + Q{i}*h(i);
> >>
> >> My question is if there is a solution/update to this problem?
> >> (other than a work-around using for example multiple
> >regression to do
> >> a second level analysis...)
> >>
> >>
> >> With kind regards,
> >>
> >> Cris Lanting
> >>
> >>
> >> ----------
> >> Ir C.P. Lanting
> >> University Medical Center Groningen
> >> BCN Neuroimaging Center
> >> Antonius Deusinglaan 2, room 125
> >> P.O.Box 196
> >> 9700 AD Groningen
> >> The Netherlands
> >> phone: +31 (0)50 3637157
> >> [log in to unmask]
> >>
> >
> >--
> >Volkmar Glauche
> >-
> >Department of Neurology
> >[log in to unmask]
> >Universitaetsklinikum Freiburg Phone 49(0)761-270-5331
> >Breisacher Str. 64 Fax 49(0)761-270-5416
> >79106 Freiburg
> >
>
>
--
Volkmar Glauche
-
Department of Neurology [log in to unmask]
Universitaetsklinikum Freiburg Phone 49(0)761-270-5331
Breisacher Str. 64 Fax 49(0)761-270-5416
79106 Freiburg
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